1. Visual decision making: a computational architecture for heterogeneous reasoning;Barker-Plummer,2004
2. A computational architecture for heterogeneous reasoning;Barker-Plummer;Journal of Theoretical and Experimental Artificial Intelligence (JETAI),2007
3. Hyperproof;Barwise,1994
4. L. Euler, Lettres à une Princesse d’Allemagne sur Divers Sujets de Physique et de Philosophie, Imprimerie de l’Academie Impériale des Sciences, 1768–1772, Letters 102–108.
5. Computers and Intractability—A Guide to the Theory of NP-Completeness;Garey,1979